Front-wheel brake



E. R. EVAN$ v FRONT WHEEL BRAKE Filed Dec. 16, 1922 2 Sheets-Sheet. 1

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, hiddfidz EDWIN 1t. EVANS, E DETROIT, MIGHXGM'.

FltON'E-WHEEL BRAKE.

- Application filed Bccember 16, 1922. Eerie! life. 6073 52.

To all whom it may concern:

Be it known that l, EDWIN R. Evans, a citizen of the United States of America, residing at Detroit, in the county of Wayne,- and State of Michigan, have invented certain new and useful Improvements in Front-Wheel..,Brakes, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to vehicle brakes and relates more particularly to front wheel brakes for motor vehicles.

The invention consists in the structural features and arrangement of parts hereinafter described.

In the drawings Figure 1 is a view in elevation of a front axle extremity showing in vertical section the corresponding front wheel and its brake plane of section being indicated at 11 in Figure 3;

Figure 2 is a similar view in horizontal section, taken on line 2-2 of Figure 3;

Figure 3 is a section transverse .to the axis of rotation of the Wheel through the brake mechanism, the plane of section being illustrated at 3-3 of Figure 1;

Figure 4 is a cross section on line H of Figure 1;

Figure 5 is a sectional detail on line 5-5 of Figure 3 showing the mounting of one of the thrust rods through which the bralc ing pressure is applied.

In these views the reference character 1 86 designates a brake drum and 2 the body of a vehicle wheel carrying said drum. Said body, as illustrated, is of a disk type but the invention is equally applicable to wheels of other well known types. Said wheel is mounted upon an axle 3 W-hich'is terminally forked to provide vertically spaced bea "ings 4'wherein pins 5 are respectively mounted fast to establish a swivel steering axis for the wheel- 2. Said pins; project upwardly Ni and downwardly from the upper and lower bearings respectively to support rotative bearings 6 which are integrally formed in diametrically opposed relation upon acircularsupport 7 for aspindle 8 upon which.

50 the wheel 2 1S 1ournaled. Said mounting hasa dished central portion 9 which aiiords clearance for the axle bearings 4. 1O designates a pair of brake shoes interiorlyengageable with the drum 1 in a horizontally opposed relation, said shoes being connected at their upper and lower. extremities by coiled springs 10* normally holding said shoes slightly spaced from said drum. Said shoes are respectively supported by a pair of diametrically aligned zontal rods 11 which, as will presently appear, thrust to said shoes. Each thrust rod 11 is preferably of square cross section and is slidably engaged with openings of corresponding cross radial bearings 12 and 13 respectively centrally integral. with each brake shoe and with the spindle support 7, the bearings 13 on said support being located at each side of the dished portion 9 thereof, as is best seen in Figure 3. Within said dished portion and between the spaced axle bearings a, the thrust rods 11 are formed with complementary semi-cylindrical heads 14, the axis of which coincides with the swivel axis established by said bearing. It is presnbstantially horifunction also to transmit the braking 9 section formed in aligned ierred to line said heads with replaceable semi-cylindrical bushings, as indicated ,at

14. 15 designates a cam. occupying the cylindrical pocket jointly formed by the heads 14, and elongated cecomplementary tween the opposed shoes in an. oblique end faces of the brake relation to said faces.

Said cam is freely longitudinally slidable in a head 16 arranged within said cylindrical pocket and formed terminally and preferably integrally upon a rock shaft 1? which extends inwardly from the wheel in the plane of the axis of the bearings 6 and is journaled in a bearing 18 formed integral with the axle 3 between said bearing 6, the inner end. of said rock shaft being provided with an actuating arm 19.. Said cam 15 is restrained from rotation within the head 16, this being accomplished preferably by forming the cam and the opening of the head receiving said cam of square (or other polygonal) cross section.

Considering the operation of the construction as so far described, when the shaft 17 is rocked by means of the arm 19, the

mews? trensmittingthe thrust of said rod to said bearings, e pin establishing e swivel steershoe adjustable in the shoe transversely of ing axis for the wheel engaging one of said 1 the rod to take up wear of the shoe. bearings, e thrust. rod for actuetingthe 10. In a vehicle wheel brake, the combinabrake shoe engaging the other hearing, and 5 tion with a brake drum carried b a vehicle means dis osed substantially coaxial with Wheel, and e brake shoe interior y engage- .the drum for actuating ssiol thrust reel.

eble with said rlrum, of a spindle .journelling In testimony whereof I efiix my sgiigt re,

said Wheel, e member having transverse EDN R E 

